Year	% gross
1983	22.7999706268311
1984	24.3938999176025
1985	26.9090690612793
1986	29.0890407562256
1987	31.7005195617676
1988	32.8929214477539
1989	32.6315498352051
1990	32.4654502868652
1991	31.5783405303955
1992	32.2337989807129
1993	32.4280281066895
1994	31.8438491821289
1995	32.747501373291
1996	33.7671203613281
1997	35.3313102722168
1998	45.4482917785645
1999	48.1071586608887
2000	48.2883911132813
2001	48.3761405944824
2002	46.3823394775391
2003	46.3952407836914
2004	47.1166381835938
2005	48.0620498657227
2006	50.2407417297363
2007	52.0381317138672
2008	54.3736305236816
2009	56.4318809509277
2010	60.2203903198242
2011	64.7455062866211
2012	70.012336730957
2013	73.0171813964844
2014	75.7511596679688
2015	77.6791229248047
2016	80.5685806274414
2017	82.8171768188477
2018	85.4034423828125
2019	86.0379104614258
2020	86.8888626098633